I did'nt know about the line-in pin capable of transmitting or receiving?
Are you sure? I think it has to be modded to have full duplex.
Half duplex is possible with no mod.
Hoewever, it still need an electrical interface for rs232.

> I talked about this earlier a bit...
>
> Since two-way communication is possible if we use both the line-in's pin
> and the in-line remote pin (man, that looks dumb written like that :) ),
> would the system be able to talk to PC-style hardware through a serial
> port? If so, would any electronics have to go in-between, or could the
> JBR hardware be co-erced into doing something that a PC could understand
> as serial (even if there was no existing protocol on the Rockbox itself,
> a custom protocol would surely be needed for such a limited device...
> can't expect it to handle a TCP/IP stack).
>
> Joe
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